问题如下：
"Delta hedging a short position in a call option is a 'buyhigh, sell-low' trading strategy." Explain this statement.
选项：
解释：
Delta hedging involves buying 6 shares for each option sold, where 6 is the delta of a long position in the option. As the share price rises, delta increases and more shares have to be bought. As the share price falls, delta decreases and shares have to be sold. The trader is therefore always buying after a price increase and selling after a price decrease.
老撕，为什么股价下跌，delta也会下跌，从后引发答案后面的那一串解释
